Chemistry - Science (Dr. Bob222)

The following reaction has a positive value of ΔG°.
2H2O(g) → 2H2(g) + O2(g)
Which of the following statements must be true?
A. The reaction is slow.
B. The reaction will not occur. That is, when H2O(g) is introduced into a flask, no O2 or H2 will form
even over a long period of time.
C. The reaction is exothermic.
D. The equilibrium lies far to the right.
E. None of these is true.

  1. 👍
  2. 👎
  3. 👁
  1. Hello, how are you?
    The correct answer to this Q is E. but I have chosen B. Could you please explain why all of them cannot be true? Thank you

    1. 👍
    2. 👎
  2. A. dG has nothing to do with speed of a reaction. Carbon is the more stable form of diamond but all the girls getting diamond rings today need not worry about that ring crumbling tomorrow. :-).
    B. All reactions occur to some extent no matter how small. So this has an extremely small Keq, so it's small but still occurs.
    C. Is the reaction exothermic. I thought the reverse reaction was exothrmic.
    D. No, the eq lies far to the left; otherwise all of our lakes and rivers would have dried up long ago and we would have plenty of oxygen and hydrogen in our atmosphere.
    E. That leaves E.

    1. 👍
    2. 👎
  3. Thank you!

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    Which of the following reactions are spontaneous (favorable)? A] 2Mg(s) + O2(g) -> 2MgO(s) Delta G = -1137 kJ/mol .. B] NH3(g) + HCl(g) -> NH4Cl(s) Delta G = -91.1 kJ/mol ... C] AgCl(s) -> Ag+(aq) + Cl-(aq) Delta G = 55.6 kJ/mol

  2. Chemistry

    Given H2(g) + (1/2)O2(g) --> H2O, ∆Hº = -286 kJ/mol, determine the standard enthalpy change for the reaction 2H2O(l) --> 2H2(g) + O2(g). Just checking... should end up with ∆Hº = 572 kJ/mol right??

  3. Chemistry

    . For the reaction 2H2(g) + 2NO(g) → N2(g) + 2H2O(g) The observed rate law is Rate =k[NO]2[H2] The mechanisms shown below have been proposed to explain the kinetics of the above reaction Which of the following are acceptable

  4. Chemistry

    Which of the reactions are spontaneous (favorable)? a. 2H2O(g)⟶2H2(g)+O2(g) Δ𝐺=457 kJ/mol b. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) Δ𝐺=−820 kJ/mol c. 2Mg(s)+O2(g)⟶2MgO(s) Δ𝐺=−1137 kJ/mol d. C(s)+H2O(l)⟶CO(g)+H2(g)

  1. Chemistry

    Consider the reaction 2H2O(g) → 2H2(g) + O2(g) ΔH = +483.60 kJ/mol at a certain temperature. If the increase in volume is 42.7 L against an external pressure of 1.00 atm, calculate ΔU for this reaction. (The conversion factor

  2. Chemistry

    From the following data at 25°C, H2(g) + Cl2(g) → 2HCl(g) ΔH0 = −185 kJ 2H2(g) + O2(g) → 2H2O(g) ΔH0 = −483.7 kJ Calculate ΔH0 at 25°C for the reaction below. 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)

  3. Chemistry

    Which of the following processes is endothermic? a) H2O (g) --> H2O (l) b) 3O2 (g) + 2CH3OH(g) --> 2CO2(g) + 2H2O(g) c) H2O (s) --> H2O (l) d) O2(g) + 2H2(g) --> 2H2O(g) I a guessing b, since energy has to go into the reaction for

  4. Chemistry

    In which reaction does the oxidation number of oxygen increase? a. Ba(NO3)2+K2SO4--->BASO4+2KNO3 b. HCL+ NaOH---> NaCl+H20 c. Mg0+ H20---> Mg(OH)2 d. 2SO2+02---> 2SO3 e. 2H2O---> 2H2+O2

  1. chemistry

    Which of the following equations does not represent an oxidation-reduction reaction? 3Al + 6HCl → 3H2 + AlCl3 2NaCl + Pb(NO3)2 → PbCl2 + 2NaNO3 2H2O → 2H2 + O2 2NaI + Br2 → 2NaBr + I2 Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

  2. Chem

    At 25°C the following heats of reaction are known: 2C2H2 + 5O2 ---> 4CO2 + 2H2O; ΔH = -2600 kJ C + O2 ---> CO2 ; ΔH = -394 kJ 2H2 + O2 ---> 2H2O; ΔH = -572 kJ At the same temperature, calculate ΔH for the following reaction:

  3. science

    Which of the following would be the limiting reagent in the reaction shown below? There are 50 molecules of O2 and 50 molecules of H2. 2H2(g) + O2(g) ==> 2H2O(g)

  4. Chemistry

    Calculate delta H for the reaction below using Hess's Law: C2H6 ---> C2H2 + 2H2 ------------------------------------------ C2H2 + 5/2O2 --> 2CO2 + H2O (H = -1300 kJ) 2H2 + O2 --> 2H2O (H= -572 kJ) 2C2H6 + 7O2 --> 4CO2 + 6H2O (H=

You can view more similar questions or ask a new question.